Just bought a 83 conversion B250, This thing is clean and runs great. 318 2bbl only problem the silicone or what ever holds the vac line on the heater control fell apart and now all the lines are just hanging there ! I need a vac diagram BAD any ideas where I get one all the manuals I see just show engine vac diagrams

 

Chilton's manuals usually have the vacuum diagrams. My Haynes manual does not show the HVAC vacuum lines. Or look on ebay for an 83 Factory Service Manual.